They do pair up, so it seems kinder to have a pair (whether this is just a human reaction or not, i'm not sure) as for using it to absorb the extra food, not a good plan to be honest, better to feed less than you think you need to.
Not sure if you would need 10 hermits and turbos, start off with 5 of each and see how they cope, better to add up than have them starve.

I suppose that is posisble, but I had the shell with about 5 of them in a seperate little tank for three weeks now with no porblems. I aclimatised them slowly and added the shell. Over night they were gone. Plus there little white tubes along the shell...

Just a little up-date on the shrimps.
I got him a little friend a week ago. As it turns out he, is now a she full of green egg sacks Although my nitrate are a bit high, it can't be that bad if they spawned within a week from getting a mate?

Fair enough Ed Thats why I want to trade the Lion...
Cool that they take turn. I didn't know that...
I doub't it in this case though since the one with the eggs is about 4 times the size of the new one...The egg sakcs are bigger than the whole little shrimp...